99乘以49
=(100-1)×49
=100×49-49
=4900-49
=4851
㈡ 99x49的簡便
99×49
=(100-1)×49
=100×49-1×49
=4900-49
=4851
㈢ 49x99簡算
49×99=49×(100-1)=49×100-49=4900-49=1851
㈣ 49×99用簡便方法計算
原式=49*100-49=4900-49=4851
㈤ 49ⅹ99ⅹ99最簡便的方法
49ⅹ99ⅹ99
=[49ⅹ(100-1)]ⅹ99
=[49ⅹ100-49]ⅹ99
=4851ⅹ(100-1)
=4851ⅹ100-4851
=485100-4851
=480249
㈥ 99x49x99,的簡便運算,怎麼算
這個題目可以運用分配率進行簡便計算,原式=(100-1)*7*7*(100-1)=(700-7)*(700-7)=480249